Katniss’s best friend
Yes. Gale Hawthorne is truly in love with Katniss, whilst she is torn between him and Peeta Mellark.
Katniss asks Gale to take care of her family, and not to let them starve while she's in the arena.
hunt. and protect katniss
He will take care of Prim!
In the woods
The non existentent berry
If you mean her friend she meets up with in the woods, he is Gale Hawthorne
Gale recommended that Katniss got a bow and arrow. She hunted with a bow, so if she had that weapon she would have an advantage.